Quarterly report pursuant to Section 13 or 15(d)

Mortgage Notes Payable and Credit Facility - Mortgages Notes Payable (Detail)

v3.19.3
Mortgage Notes Payable and Credit Facility - Mortgages Notes Payable (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
mortgage
property
Sep. 30, 2018
USD ($)
property
Dec. 31, 2018
USD ($)
Dec. 27, 2018
property
Debt Instrument [Line Items]        
Aggregate Fixed Rate Debt Repaid $ 48,116 $ 24,888    
Number of properties acquired | property 9 2    
Variable rate mortgage loans        
Debt Instrument [Line Items]        
Aggregate Fixed Rate Debt Repaid     $ 13,600  
Variable rate mortgage loans | LIBOR | Weighted average        
Debt Instrument [Line Items]        
Spread on LIBOR (as percent)     2.47%  
Variable rate mortgage loans | LIBOR | Weighted average | Property maturing February 8, 2029        
Debt Instrument [Line Items]        
Spread on LIBOR (as percent) 1.80%      
Fixed rate mortgage loans        
Debt Instrument [Line Items]        
Aggregate Fixed Rate Debt Repaid $ 25,042      
Stated interest rate (as percent) 4.18%      
Fixed rate mortgage loans | LIBOR | Weighted average | Property maturing February 8, 2029        
Debt Instrument [Line Items]        
Spread on LIBOR (as percent) 1.80%      
New fixed rate mortgage notes payable        
Debt Instrument [Line Items]        
Stated interest rate (as percent) 3.95%      
Aggregate Fixed Rate Debt Issued $ 41,140      
New fixed rate mortgage notes payable | Property maturing February 8, 2029        
Debt Instrument [Line Items]        
Stated interest rate (as percent) 4.70%      
Term of debt 7 years      
Aggregate Fixed Rate Debt Issued $ 10,600      
Number of properties acquired | property       1
New fixed rate mortgage notes payable | Property maturing June 1, 2024        
Debt Instrument [Line Items]        
Stated interest rate (as percent) 3.42%      
Aggregate Fixed Rate Debt Issued $ 21,600      
Number of properties acquired | property       1
New fixed rate mortgage notes payable | Property maturing June 18, 2024        
Debt Instrument [Line Items]        
Stated interest rate (as percent) 4.35%      
Aggregate Fixed Rate Debt Issued $ 8,900      
New fixed rate mortgage notes payable | Treasury Rate | Property maturing February 8, 2029        
Debt Instrument [Line Items]        
Term of debt 3 years      
Mortgages | Variable rate mortgage loans debt extended        
Debt Instrument [Line Items]        
Term of debt 2 years 4 months 10 days      
Aggregate Variable Rate Debt Extended $ 12,561      
Number of Long Term Mortgages Maturities Extended | mortgage 2      
Number of Properties Maturity Extended to Collateralized Mortgage Notes Payable | property 4      
Mortgages | Variable rate mortgage loans debt extended | LIBOR | Weighted average        
Debt Instrument [Line Items]        
Spread on LIBOR (as percent) 2.51117%